I would recommend you look very closely at the teaching faculty, the management/administration, and other private K-12 schools for comparison purposes.

In the GCC, the words English, American, International, etc. in the name of the school does not necessarily mean it is of a British, American, or International standard/quality/curriculum. I'm not saying EMS is trying to present itself as something it's not - I don't know them at all - but if you've never worked in the Gulf and haven't done YOUR homework - you might be surprised when you land here to discover that it isn't what you expected.

Ask them lots of questions, ask to be put in touch with teachers already working there, what are the salary and benefits being offered - all of these are very important to successfully acclimate to working in the Gulf.

You might go to daveseslcafe.com which has a little info on K-12 schools (mostly on the UAE though) that might help you in your research and formulating questions to ask your potential employer.

This is not to scare you or to slander EMS - they want good, qualified teachers who will be happy no doubt - to be that, you have to be informed.